Sell video doorphone SZC-818AE

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the video phone system for comunity with more than one entrance ;
almico protection shell;
backlit button at might time;
LCD display
infra-red light source a migt tie ;
Monitoring, calling&momitoring;
restrict unwelcome callers ;
6-digit room address(unit mumber+room no) ;
technical characteristics:
power : 12v110%
resolution:430TV line;
unlock time:0.5 seconds
ambient temperature:-250~+700
ambient humidity:45%-95%
talking time:automatically
swithching-off in 45 seconds